How it handles the mountains depends on what it is. Is it an auto shift (manual trans that shifts by computer) or is it an Allison auto? Depending on the model of Allison it could do fairly well. How many forward gears does it have? Most auto shift are either 10 or 12 speed transmissions and the Allison would probably have 6 speeds with 5 & 6 being overdrive.
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For now 1996 Dodge Ram 5.9 Cummins 365HP 830TQ pulling a 2006 28' Dutchmen Fifthwheel and at times a 16' boat behind that!
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